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Best of Luck Q1. Hairs of shaving brush cling together when it is removed from water due to- (a) force of attraction between hair (b) surface tension (c) viscosity of water (d) characteristic property of hair Q2. Coatings used on raincoat are waterproof because they - (a) increases angle of contact (b) decreases angle of contact (c) does not alters angle of contact (d) forms a smooth surface Q3. A body measures 5 N in air and 2 N when put in water. The buoyant force is- (a) 7 N (b) 9 N (c) 3 N (d) None of these Q4. A hole is made at the bottom of the tank filled with water (density = 1000 kg/m³). If the total pressure at the bottom of the tank is three atmospheres (1 atmosphere = 10⁵ N/m²), then the velocity of efflux is nearest to- (a) 20 m/s (b) 10√2 m/s (c) 20√2 m/s (d) √500 m/s Q5. When the temperature is increased the angle of contact of a liquid? (a) increases (b) decreases (c) remains the same (d) first increases and then decreases Q6. The surface tension of a soap solution is 2

Multiple Choice Questions Q1. The removal of Hydrogen from a substance is known as ---- (i) oxidation (ii) dehydration (iii) reduction (iv) crystallisation Q2. The development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is ---- (i) acidity (ii) rancidity (iii) displacement (iv) sublimation Q3. In order to obtain a yellow precipitate from Lead Nitrate , you should mix a solution of ---- (i) Potassium Chloride (ii) Potassium Iodide (iii) Potassium Bromide (iv) Potassium Cyanide Q4. In exothermic reactions ---- (i) thermostat is required (ii) energy is released (iii) Energy is absorbed (iv) None of the above Q5. Find a & b in - (i) a = 1, b = 1 (ii) a = 1, b = 2 (iii) a = 3, b = 1 (iv) a = 2, b = 1 Q6. Which gas/gases are released when FeSO 4 is heated? (i) Sulphur Dioxide (ii) Sulphur Trioxide (iii) Both (i) & (ii) (iv) None of these Q7. Which compound is used in black and white photography? (i) Silver Chloride (ii) Sil

  Q1. Melting and boiling are examples of - A. adiabatic process B. isobaric process C. isothermal process D. cyclic process Q2. For an isothermal process the change in internal energy is - A. positive B. negative C. zero D. infinite Q3. Specific heat capacity of any gas for isothermal process is - A. zero B. infinite C. 1 D. log10⁵ Q4. For a cyclic process the change in internal energy is - A. positive B. negative C. Zero D. infinite Q5. Which is not an extensive variable ? A. Pressure B. mass C. volume D. internal energy Q6. First law of thermodynamics is based on - A. Law of conservation of momentum B. Law of conservation of angular momentum C. Law of conservation of mass D. None of these Q7. The slope of pressure volume curve in an adiabatic process is - A. Equal to the slope of isothermal process B. 'γ' times the slope of isothermal process C. "1/γ" times the slope of isothermal process D. Negative to the slope of isothermal process Q8. An ideal gas of volume 0.